package com.yc.demo.d0301;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "GetDataServlet", value = "/GetDataServlet")
public class GetDataServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");

        //获取请求对象中的数据
        //请求对象的有效期之内有效
        final Object data = request.getAttribute("data");

        //获取会话中的数据

        //会话在多个请求中一直有效 =》 同一个会话对象
        final Object data1 = request.getSession().getAttribute("data");

        final PrintWriter out = response.getWriter();

        out.printf("请求中的数据data :  %s <br>", data);
        out.printf("会话中的数据data1 : %s <br>", data1);
        out.printf("会话id： %s <br>",request.getSession().getId());

    }





    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}
